V250LS4 Equivalent & Substitute Parts

Part Overview

The V250LS4 is a 390 V, 1.2 kA varistor manufactured by Littelfuse Inc., designed for transient voltage suppression in through-hole disc 7mm packaging. This part is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. Substitute parts maintain identical electrical and mechanical specifications while offering active product status and improved availability.

Key Parameters

Parameter	Value
Maximum AC Volts	250 V
Maximum DC Volts	330 V
Varistor Voltage (Typical)	390 V
Varistor Voltage Range	351 V – 429 V
Current - Surge	1.2 kA
Energy	21 J
Number of Circuits	1
Capacitance @ 1 MHz	90 pF
Operating Temperature Range	-55°C to 85°C
Mounting Type	Through Hole
Package / Case	Disc 7mm
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the V250LS4 is based on strict parametric equivalence across all electrical and mechanical specifications. All substitute parts maintain identical values for maximum AC/DC voltage ratings, varistor voltage range, surge current capacity, energy dissipation, circuit count, capacitance, operating temperature range, mounting type, and package dimensions. Substitutes differ only in series designation (LS, LT, LU) and packaging format (Cut Tape vs. Tape & Reel), which do not affect electrical performance or mechanical compatibility in through-hole applications.

The key parameters determining substitution eligibility are:

Varistor voltage (typical): 390 V
Surge current: 1.2 kA
Package type: Disc 7mm through-hole
Operating temperature: -55°C to 85°C
Compliance: ROHS3

Parameter Comparison

Part Number	Manufacturer	Series	Packaging	Product Status	Max AC (V)	Max DC (V)	Varistor Voltage Typ (V)	Surge Current (kA)	Energy (J)	Operating Temp (°C)	RoHS Status
V250LS4	Littelfuse Inc.	LS	—	Obsolete	250	330	390	1.2	21	-55 to 85	ROHS3
V250LS4P	Littelfuse Inc.	LS	Cut Tape (CT)	Active	250	330	390	1.2	21	-55 to 85	ROHS3
V250LS4PX2855	Littelfuse Inc.	LS	Tape & Reel (TR)	Active	250	330	390	1.2	21	-55 to 85	ROHS3
V250LT4P	Littelfuse Inc.	LT	Cut Tape (CT)	Active	250	330	390	1.2	21	-55 to 85	ROHS3
V250LT4PX2855	Littelfuse Inc.	LT	Tape & Reel (TR)	Active	250	330	390	1.2	21	-55 to 85	ROHS3
V250LU4P	Littelfuse Inc.	LU	Tape & Reel (TR)	Active	250	330	390	1.2	21	-55 to 85	ROHS3
V250LU4PX2855	Littelfuse Inc.	LU	Tape & Reel (TR)	Active	250	330	390	1.2	21	-55 to 85	ROHS3

Engineering Selection Recommendations

All substitute parts are manufactured by Littelfuse Inc. and carry active product status, ensuring long-term availability and supply chain stability. All parts are ROHS3 compliant and carry REACH Unaffected status where applicable, meeting current environmental and regulatory requirements.

For new designs and production transitions, V250LS4P (Cut Tape) or V250LS4PX2855 (Tape & Reel) are recommended as primary replacements, maintaining the LS series designation. V250LT4P, V250LT4PX2855, V250LU4P, and V250LU4PX2855 are parametrically equivalent alternatives across different series and packaging formats.

Packaging selection should be based on assembly requirements: Cut Tape (CT) for manual or low-volume pick-and-place operations, and Tape & Reel (TR) for automated high-volume production lines.

Frequently Asked Questions (FAQ)

Q: Can V250LT4P or V250LU4P be used as direct replacements for V250LS4?

A: Yes. All substitute parts maintain identical electrical specifications (390 V typical varistor voltage, 1.2 kA surge current, 21 J energy) and mechanical compatibility (through-hole disc 7mm package). Series designation (LS, LT, LU) does not affect electrical performance or physical fit.

Q: What is the difference between Cut Tape and Tape & Reel packaging?

A: Cut Tape (CT) packaging is suitable for manual assembly and lower-volume applications. Tape & Reel (TR) packaging is designed for automated pick-and-place equipment in high-volume production. Both formats contain identical components with the same electrical and mechanical specifications.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts are ROHS3 compliant and carry REACH Unaffected status, meeting current environmental regulations.

Q: Why is the original V250LS4 marked as obsolete?

A: The V250LS4 has been superseded by active product variants. Substitute parts with active status provide equivalent performance with improved availability and long-term supply assurance.

Q: Can packaging format be mixed in production?

A: Yes. Cut Tape and Tape & Reel formats contain identical components. Packaging selection should align with assembly equipment capabilities and production volume requirements.

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